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Jaguar rethinks electric supercars

By: 
Staff Writer

Thu, 2010/09/30 - 10:15am — asholdfield

Jaguar rethinks electric supercars
By: 
Staff Writer

Jaguar has revealed a stunning range-extended electric supercar concept car. The C-X75 has been designed to celebrate 75 years of the marque and provide a glimpse into the future of Jaguar and its commitment to producing beautiful, fast cars powered by sustainable means.

MORE IMAGES OF THE C-X75

The 330kph four-wheel drive supercar is capable of running in purely electric (zero tailpipe emissions) mode for 110km on a six-hour domestic plug-in charge. The innovative, lightweight micro gas-turbines are also capable of very quickly and efficiently recharging the Lithium-ion batteries, giving the car a theoretical range of 900km.

This remarkable range-extension system is a result of Jaguar’s research engineers adopting a clean-sheet approach to the question of powering the supercars of the future. The C-X75 turns to the very latest evolution of a pioneering British technology: the gas turbine.

Developed in partnership with Bladon Jets, the miniaturised turbine blade - the first viable axial-flow micro-turbine - increases the compression and efficiency of micro gas-turbines to the point at which they can be viewed as a realistic power source. Each of the micro gas-turbines weighs just 35kg and produces 70kW of power at a constant 80,000rpm.

The energy created by the turbines and stored in the batteries is transmitted to the road using four independent electric motors. Using individual motors has benefits in terms of weight-saving and distribution, packaging and efficiency. Each motor weighs just 50kg but produces 145kW of power and an astonishing combined total torque output of 1600Nm.

Because each wheel is driven by its own electric motor, the C-X75 is four-wheel drive – with all the traction, grip and safety benefits that entails – without the weight disadvantages of a purely mechanical set-up. Inherent in this drivetrain is the ability to independently vector torque to each wheel across the full speed range. This offers potential benefits in terms of stability and control, creating an infinitely and instantaneously adjustable traction and stability control system. 

Aerodynamics have always played a large part in Jaguar design with the late designer Malcolm Sayer elevating it into an art form in cars such as the XJ13, the prototype from which the C-X75 draws inspiration.  

Jaguar has increased the design’s aerodynamic efficiency dramatically by opening the front grille and brake cooling vents only when necessary. At the rear corners of the car vertical control surfaces automatically engage at higher speeds to direct airflow aft of the rear wheels for increased stability and efficiency.

The carbon-fibre rear diffuser, a crucial element in guiding airflow under the car and creating downforce includes an active aerofoil, which is lowered automatically as speed increases. Vanes in the exhaust ports then alter the directional flow of the gases to further increase the effectiveness of the Venturi tunnel.

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